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From: John Woodgate
Subject: Re: Coming soon to a theatre near you - endless mischief potential
Date: Sun, 13 Oct 2002 20:49:03 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Sun, 13 Oct 2002 19:52:09 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that James Meyer
wrote (in ) about 'Coming soon to a theatre near you - endless mischief
potential', on Sun, 13 Oct 2002:
> It's my understanding from a quick look at the technique some time ago
>that TWO beams are used. The axis of the beams intersect at a point somewhere
>and that creates an area where the interference occurs and the audible sound is
But the beams are rapidly attenuated in air. So the crossing point must
be close to the source.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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